HOME >> BIOLOGY >> NEWS
Size matters if you're a rodent

Promiscuity is common among female rodents, leading to competition between the sperm of rival males over who fertilizes the eggs. It now seems that possessing a longer penis may give males an advantage in this competition, according to new research to be published in the March issue of The American Naturalist. Dr. Steve Ramm, an evolutionary biologist at the University of Liverpool, UK, compared the relative size of the penis bone in several mammal groups: "The data for rodents seem pretty clear cut. Species where sexual competition between males is most intense also tend to have the longest penises. But, interestingly, a similar pattern was not detected in either primates or bats." Understanding the reasons for these differences will require a better understanding of the precise mechanisms through which male rodents benefit from longer penises, something which comparative data alone cannot address.

Overall, the rodent with the longest penis bone relative to its body size in the study was the Western harvest mouse, Reithrodontomys megalotis. "Everything's relative of course," explains Dr. Ramm, "so although big for its body size the penis bone in R. megalotis is still only 7 to 8 mm long. I dont think the phrase 'hung like a harvest mouse' will be catching on any time soon."

The study of genitalia has a long history in evolutionary biology. Because genitalia evolve very rapidly compared to other body structures, they are often the only means through which scientists can tell two closely related species apart. Since their primary function is essentially the same in all animals, this great diversity in genital structure has been something of a puzzle. The new research in mammals adds to a growing body of evidence that sexual selection competition between males and potentially also choice by females is the driving force responsible.


'"/>

Contact: Patricia Morse
pmorse@press.uchicago.edu
773-702-0446
University of Chicago Press Journals
27-Feb-2007


Page: 1

Related biology news :

1. Researchers find that bumblebees flower choice matters
2. Particle size matters to bacteria ability to immobilize heavy metals
3. UCSB researchers discover shape matters to macrophages
4. Size matters: Preventing large mammal extinction
5. Space matters: Estimating species diversity in the fossil record
6. Size matters: fish genitalia attractiveness vs. predatory escape value
7. Field-cricket study shows that when it comes to competition, sperm quality matters
8. See what youre spewing as you speed along
9. 150K to find out why youre a slime ball
10. Pay up, youre being watched
11. Scientists discover new species of distinctive cloud-forest rodent

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Size matters you rodent

(Date:2/24/2015)... -- This report analyzes the worldwide markets for Face and Voice ... Voice Biometrics. The report provides separate comprehensive analytics for the US, ... Europe , Asia-Pacific , ... Latin America . Annual estimates and forecasts are ... analysis is provided for these markets. Market data and analytics are ...
(Date:2/13/2015)... 13, 2015 ACT Genomics Co., Ltd., ... to transform cancer genomic information into precision diagnosis ... has raised US$ 8 million in the its first ... Taipei, Taiwan , ACT Genomics has ... the aim to implement next generation sequencing (NGS) ...
(Date:2/9/2015)... , Feb. 9, 2015  Lintec of America recently ... for carbon nanotube (CNT) macrostructures, including sheets, yarns and ... (UTD). Leveraging the vast industrial resources of ... Japan , Lintec of America is forming the ... TX , focusing on scaling up the manufacturing ...
Breaking Biology News(10 mins):World Face and Voice Biometrics Industry 2World Face and Voice Biometrics Industry 3World Face and Voice Biometrics Industry 4World Face and Voice Biometrics Industry 5World Face and Voice Biometrics Industry 6World Face and Voice Biometrics Industry 7World Face and Voice Biometrics Industry 8World Face and Voice Biometrics Industry 9World Face and Voice Biometrics Industry 10World Face and Voice Biometrics Industry 11World Face and Voice Biometrics Industry 12World Face and Voice Biometrics Industry 13World Face and Voice Biometrics Industry 14World Face and Voice Biometrics Industry 15World Face and Voice Biometrics Industry 16ACT Genomics Raises $8 Million in its First Private Funding Round 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4
(Date:3/4/2015)... , Mar. 04, 2015 Research and Markets ... addition of Jain PharmaBiotech,s new report "Biomarkers ... offering. This report follows the ... that can be objectively measured and evaluated as ... as well as pharmacological responses to a therapeutic ...
(Date:3/4/2015)... CA (PRWEB) March 04, 2015 ... leader in Personalized Medicine, is excited to announce ... Genetic Testing to Optimize the Management of Pain”. ... available at Medscape.com for the next year. The ... professionals how to recognize inadequate pain treatments, integrate ...
(Date:3/4/2015)... 04, 2015 Follow us on ... of the fastest growing technologies in the life sciences ... visualization is driving growth in nucleic acid detection technologies ... of gene expressions will continue to benefit the qPCR ... fields ranging from pharma, biotech, food & beverage to ...
(Date:3/3/2015)... SAN DIEGO and TORONTO, March 3, 2015 /PRNewswire/ - ... company developing new therapeutics and molecular diagnostics that target ... for the quarter and seventh-month period ended December 31, ... changed its fiscal year end from May 31 to ... periods we are reporting today are for the quarter ...
Breaking Biology Technology:Global Biomarkers Report 2014-2024 - Technologies, Markets and Companies 2Global Biomarkers Report 2014-2024 - Technologies, Markets and Companies 3Proove Biosciences Launches CME Accredited Program with Medscape 2Proove Biosciences Launches CME Accredited Program with Medscape 3Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 2Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 3Focus on Quantifying Nucleic Acid Molecules Spurs Growth in the qPCR & dPCR Instrumentation Market, According to a New Report by Global Industry Analysts, Inc. 4Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 2Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 3Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 4Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 5Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 6Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 7Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 8Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 9Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 10Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 11Aptose Biosciences reports results for the quarter and seven months ended December 31, 2014 12
Cached News: